/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.security.oauth2.server.resource.web;

import javax.servlet.http.HttpServletRequest;

import org.springframework.util.Assert;

/**
 * Generic resolver extracting pre-authenticated JWT identity from a custom header.
 *
 * @author Elena Felder
 * @since 5.2
 */
public class HeaderBearerTokenResolver implements BearerTokenResolver {

	private String header;

	public HeaderBearerTokenResolver(String header) {
		Assert.hasText(header, "header cannot be empty");
		this.header = header;
	}

	@Override
	public String resolve(HttpServletRequest request) {
		return request.getHeader(this.header);
	}

}
